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Acetal Homopolymer (Delrin®)

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Delrin® is a crystalline plastic that offers an excellent balance of properties that bridge the gap between metals and plastics. Delrin® possesses high tensile strength, creep resistance and toughness. It also exhibits low moisture absorption. It is chemically resistant to hydrocarbons, solvents and neutral chemicals. These properties along with its fatigue endurance make Delrin® ideal for many industrial applications.

Delrin®’s overall combination of physical, tribological and environmental properties make it ideal for many industrial wear and mechanical applications. Parts exposed to a moist or wet environment, such as pump and valve components, are especially appropriate. Other common uses for Delrin® include gears, bearings, bushings, rollers, fittings and electrical insulator parts.


Primary Specification (Resin) (Typical) Shapes Specification (Typical)
ASTM-D-4181 POM110B34330 ASTM-D-6100 S-POM0111

Property ASTM Test Method Units Delrin® 150
Density D792 lbs/in3 0.0513
Specific Gravity D792 g/cc 1.42
Water Absorption, @ 24 hours, 73°F D570 % 0.25
Water Absorption, @ Saturation, 73°F D570 % 0.9
Tensile Strength @ Yield, 73°F D638 psi 9,000
Tensile Modulus D639 psi 350,000
Elongation @ Break, 73°F D638 % 25
Flexural Strength, 73°F D790 psi 11,500
Flexural Modulus, 73°F D790 psi 420,000
Compressive Strength D695 psi 5,200
Izod Impact Strength, 73°F D256 ft-lbs/in 1.5
Rockwell Hardness, 73°F D785 M (R) Scale M 94 (120)
Wear Factor Against Steel, 40 psi, 50 fpm D3702 in3/hr x 1/PV 55 x 10-10
Static Coefficient of Friction D3702  
Dynamic Coefficient of Friction, 40 psi, 50 fpm D3702   0.2
Heat Deflection Temperature @ 66 psi D648 °F 336
Heat Deflection Temperature @ 264 psi D648 °F 257
Coefficient of Linear Thermal Expansion D696 in/in/°F 6.8 x 10-5
Maximum Servicing Temperature, Intermittent   °F 300
Maximum Servicing Temperature, Long Term UL746B °F 185
Specific Heat   BTU/lb-°F 0.35
Thermal Conductivity    
Melting Point D2133 °F 347
Flammability UL94   HB (1.47)
Volume Resistivity D257 ohm-cm 1015
Dielectric Strength D149 V/mil 500
Dielectric Constant, @ 60 Hz, 73°F, 50% RH D150   3.7
Dielectric Constant, @ 1 MHz D150   3.7
Dissipation Factor, @ 60 HZ, 73°F D150   0.005

NOTE: The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.

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